Internal furnace for steam-boilers.



Patented May 22, 1900.

(A lication filed Aug. 1, 1898.)

0 BRUNLER INTERNAL FURNACE FOB STEAM BOILERS.

(No Model.)

Wag/261,765.

& 987301745 e/wm Jaw 63k? UNITED STATES PATENT OFFICE.

OSCAR BRUNLER, OF EILENBURG, GERMANY.

INTERNAL FURNACE F OR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 649,977, dated May 22, 1900.

Application filed August 1 1898. Serial No. 687,458- (No model.)

To all whom it may concern:

Be it known that I, OSCAR BRiiNLnR, mechanical engineer, a subject of the Emperor of Germany, residing at Eilenburg, in the Empire of Germany, have invented certain new and useful Improvements in Internal Furnaces for Steam-Boilers, of which the following is a specification.

My invention relates to the firing of steams boilers, and more especially to steam-boilers with an internal furnace, where the flame is kept in operation within the water and in the steam-dome.

In the accompanying sheet of drawings, Figure 1 shows a vertical section through a steam-boiler provided with my new improved internal furnace, and Fig. 2 is a horizontal section on the line 00 00 of Fig. 1.

Compressed air mixed with gaseous, liquid, or powdered fuel is introduced through the pipe a into the burner A. The pressure with which this combustible mixture is pressed in must be higher than the internal steampressure plus the pressure of the column of water at the mouth 0 of the furnace or burner A. Within the burner A, which in shape somewhat resembles a diving-bell, the combustible mixture is ignited and burns with such violent force as to drive the Water away from the mouth 0 of the burner as is shown in Fig. 1. A cylindrical mantle d is provided in the burner A, having a number of passages f for the admission of the combustible mixture. This cylinder d, which, however, is not absolutely necessary, very soon becomes red-hot, and the blown-in liquid fuel quickly evaporates and is then ignited. Part of the burning gases can be conducted by means of the standpipe g into the steamdome.

The igniting device or auxiliary burner, which can also be made use of to heat the burner A, is shown in Fig. 2. The burner 71, of similar construction to the main burner A, is heated by a lamp in the well-known manner, as is also the auxiliary igniting-tube m. The combustible mixture is pressed in through pipe 2'. The cock k is opened a little, when part of the gas formed in the burner It will pass through the hot tube m, where ignition will take place, and will then escape through the cock 7c. As soon as a flame shoots out of the cook the latter is to be closed, and the burner It now performs its function. The'burning gases pass through pipe on into the main burner A and heat. the latter until constant gasification and ignition is established within it.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. In an internal furnace for steam-boilers in combination the main burner A, the stand-pipe g, the cylindrical mantle (1, being provided with passages f, the supply-pipe a, the auxiliary burner 72., the supply-pipe iand the pipe 1%, connecting the said auxiliary burner with the main burner, as and for the purpose specified.

2. In an internal furnace for steam-boilers in combination the main burner A, the

stand-pipe g, the cylindrical mantle cl, being provided with passages f, the supply-pipe a,

the auxiliary burner h, the supply-pipe c,

the pipe 172, connecting the said auxiliary burner with the main burner, the auxiliary igniting-tube Z and the cook 70 as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

OSCAR BRUNLER.

Witnesses:

ARTHUR WEISEY, PAUL SIEBERT. 

